<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>九宫格</title>
    <style>
        body{
            width: 600px;
            height: 600px;
            margin: 0 auto;
        }
        .cc{
            width: 600px;
            height: 600px;
        }
        .cc .c1{
            background-color: aqua;
        }
        .cc .c2{
            background-color: aquamarine;
        }
        .cc .c3{
            background-color: rgb(22, 219, 64);
        }
    </style>
</head>
<body>
    <table class="cc">
        <tr class="c1">
           <td>1</td>
           <td>2</td>
           <td>3</td>
        </tr>
        <tr class="c2">
           <td>4</td>
           <td>5</td>
           <td>6</td>
        </tr>
        <tr class="c3">
           <td>7</td>
           <td>8</td>
           <td>9</td>
        </tr>
    </table>
</body>
</html>